Just starting, how do you guys size up?

Well, I'm scalping and currently, I have just been trading 100 lots. For the past week, I've tired 200 lots and want to be consistent trading 200 lots because I want to have progress, but moving from 100 lots to 200 lots is not that big of a change but the numbers (profit/loss) is x2 so I'm still a little anxious, nervous as if I lose, I will lose twice as much...

How do you guys progress from moving up in lots as you learn? How do you feel physcologically or is it something that you just have to get use to, and once you know it, 200 lots is nothing...?
How do you guys progress? Do you go...100, 200, 400, 600, 800, 1000?

When I test a new method I start as small as possible. Sometimes I trade as little as 1 share. The idea is to test if the system has hidden flaws, not to make a big pile of cash. If the test appears good, then I increase the position size.

I find it helpful to consider how my system behaves under the worst possible condition - a long continuing losing streak. If I can survive the long losing streak then I might have a system that I can feel comfortable actually trading my real money.

Well, I'm scalping and currently, I have just been trading 100 lots. For the past week, I've tired 200 lots and want to be consistent trading 200 lots because I want to have progress, but moving from 100 lots to 200 lots is not that big of a change but the numbers (profit/loss) is x2 so I'm still a little anxious, nervous as if I lose, I will lose twice as much...

How do you guys progress from moving up in lots as you learn? How do you feel physcologically or is it something that you just have to get use to, and once you know it, 200 lots is nothing...?
How do you guys progress? Do you go...100, 200, 400, 600, 800, 1000?

More...

Depends on how liquid the stock is. NYSE,AMEX, or NASDAQ?

Sounds like your leveling in like you should. If you can make money with 100 or 200 size lots then you can make money with 1000 or 2000 size lots. It al l falls back on your money/risk management/percentage of stop...